[Closed Case]

The high idle is for the CAT to heat up to lower tail pipe emissions.

 

[Closed Case]

Firm pedal brake, [engage Reverse], garage door opening, cleared for take-off, no jerk or loud sounds, purr off the pad onto the roadway.

Go.

 

[Closed Case]

Should You Warm Up Your Car Before Driving? - Consumer Reports

Consumer Reports fills you in on whether you should warm up your car before driving. Letting your car idle might not be the hottest idea.

www.consumerreports.org

 

[Closed Case]

Do You Need To Warm Up Your Car? Modern Cars And Warming Cycles

Cold Starts: How Long Should You Let Your Car Idle To Warm Up Before Driving?

Is warming up your car before you drive really necessary, or is it just a myth?

carbuzz.com

Getting your car up to the perfect operating temperature by letting it idle for a while is a concept carried over from the days when most cars made use of carbureted engines which were notorious for cold start issues. These engines make use of manual fuel and air adjustments and use what is called a choke to restrict airflow during cold starts, which in turn creates a fuel-rich mixture ready for combustion. This is because cold air is denser than warm air and makes a lean air to fuel mixture. New fuel-injected engines use electronic sensors to automatically adjust the air-fuel ratio so that the car will start, even on the coldest of mornings, and will continuously adjust this ratio until the vehicle reaches its optimal operating temperature.

Another thought that has carried over from older engines suggesting that warming up your car is vital is that when the engine is cold, the gasoline takes longer to evaporate, and when too much is introduced into the combustion chamber, excess fuel can make its way onto the cylinder walls. Gasoline is a solvent and can wash away the protective layer of oil that keeps the cylinder walls lubricated between piston strokes. Without the friction protection offered by motor oil, the cylinder walls can eventually become scored and damaged. While this is a true concern, most modern engines are fully lubricated within twenty seconds of start-up, ensuring sufficient lubrication..

So, the question remains - should you warm up your car before driving off? According to most experts and manufacturers, modern vehicles don't need a dedicated warm-up time and starting your car and spending twenty to thirty seconds adjusting mirrors and buckling up is usually more than enough. In extremely cold weather, most manufacturers recommend driving gently for the first six to ten minutes but do not recommend idling your car for extended periods to warm it up. Many performance car drivers and motoring enthusiasts still prefer to spend a few minutes getting their engine up to temperature before driving off, even if it's not mechanically a requirement.